snmplib/snmp_api.c

   1
   2
   3 /**********************************************************************
   4  *
   5  *           Copyright 1997 by Carnegie Mellon University
   6  *
   7  *                       All Rights Reserved
   8  *
   9  * Permission to use, copy, modify, and distribute this software and its
  10  * documentation for any purpose and without fee is hereby granted,
  11  * provided that the above copyright notice appear in all copies and that
  12  * both that copyright notice and this permission notice appear in
  13  * supporting documentation, and that the name of CMU not be
  14  * used in advertising or publicity pertaining to distribution of the
  15  * software without specific, written prior permission.
  16  *
  17  * CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  18  * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  19  * CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  20  * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  21  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  22  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  23  * SOFTWARE.
  24  *
  25  **********************************************************************/
  26
  27 #include "squid.h"
  28
  29 #include <stdio.h>
  30
  31 #if HAVE_UNISTD_H
  32 #include <unistd.h>
  33 #endif
  34 #if HAVE_STDLIB_H
  35 #include <stdlib.h>
  36 #endif
  37 #if HAVE_SYS_TYPES_H
  38 #include <sys/types.h>
  39 #endif
  40 #if HAVE_CTYPE_H
  41 #include <ctype.h>
  42 #endif
  43 #if HAVE_GNUMALLOC_H
  44 #include <gnumalloc.h>
  45 #elif HAVE_MALLOC_H
  46 #include <malloc.h>
  47 #endif
  48 #if HAVE_MEMORY_H
  49 #include <memory.h>
  50 #endif
  51 #if HAVE_STRING_H
  52 #include <string.h>
  53 #endif
  54 #if HAVE_STRINGS_H
  55 #include <strings.h>
  56 #endif
  57 #if HAVE_BSTRING_H
  58 #include <bstring.h>
  59 #endif
  60 #if HAVE_SYS_SOCKET_H
  61 #include <sys/socket.h>
  62 #endif
  63 #if HAVE_NETINET_IN_H
  64 #include <netinet/in.h>
  65 #endif
  66 #if HAVE_ARPA_INET_H
  67 #include <arpa/inet.h>
  68 #endif
  69 #if HAVE_SYS_TIME_H
  70 #include <sys/time.h>
  71 #endif
  72 #if HAVE_NETDB_H
  73 #include <netdb.h>
  74 #endif
  75
  76 #include "asn1.h"
  77 #include "snmp.h"
  78
  79 #include "snmp-internal.h"
  80 #include "snmp_impl.h"
  81 #include "snmp_session.h"
  82 #include "snmp_error.h"
  83 #include "snmp_vars.h"
  84 #include "snmp_pdu.h"
  85 #include "snmp_msg.h"
  86
  87 #include "snmp_api.h"
  88 #include "snmp_api_error.h"
  89 #include "snmp_api_util.h"
  90
  91 #include "util.h"
  92
  93 /**********************************************************************/
  94
  95 /*
  96  * Takes a session and a pdu and serializes the ASN PDU into the area
  97  * pointed to by packet.  out_length is the size of the data area available.
  98  * Returns the length of the encoded packet in out_length.  If an error
  99  * occurs, -1 is returned.  If all goes well, 0 is returned.
 100  */
 101 int
 102 snmp_build(session, pdu, packet, out_length)
 103 struct snmp_session *session;
 104 struct snmp_pdu *pdu;
 105 u_char *packet;
 106 int *out_length;
 107 {
 108     u_char *bufp;
 109
 110     bufp = snmp_msg_Encode(packet, out_length,
 111                            session->community, session->community_len,
 112                            session->Version,
 113                            pdu);
 114     snmplib_debug(8, "LIBSNMP: snmp_build():  Packet len %d (requid %d)\n",
 115                   *out_length, pdu->reqid);
 116
 117     if (bufp == NULL)
 118         return (-1);
 119
 120     return (0);
 121 }
 122
 123 /*
 124  * Parses the packet received on the input session, and places the data into
 125  * the input pdu.  length is the length of the input packet.  If any errors
 126  * are encountered, NULL is returned.  If not, the community is.
 127  */
 128 u_char *
 129 snmp_parse(struct snmp_session * session,
 130            struct snmp_pdu * pdu,
 131            u_char * data,
 132            int length)
 133 {
 134     u_char Community[128];
 135     u_char *bufp;
 136     int CommunityLen = 128;
 137
 138     /* Decode the entire message. */
 139     data = snmp_msg_Decode(data, &length,
 140                            Community, &CommunityLen,
 141                            &session->Version, pdu);
 142     if (data == NULL)
 143         return (NULL);
 144
 145     bufp = (u_char *) xmalloc(CommunityLen + 1);
 146     if (bufp == NULL)
 147         return (NULL);
 148
 149     strncpy((char *) bufp, (char *) Community, CommunityLen);
 150     bufp[CommunityLen] = '\0';
 151
 152     session->community = bufp;
 153     session->community_len = CommunityLen;
 154
 155     return (bufp);
 156 }